b16 running rich ?? help

[xEKx]

So i got 00 civic si b16a2 and i had 440cc injectors and fuel regulator when i got the car and the car would run so good and pull super hard with vtec
but the gas was killing me so i had to change the injectors to stock b16 and now the car still pulls but not as hard as before my Question is what should be the FUEL Pressure i got it 43psi at the moment or what i need to do/ get to get good miles as well as performance??


did the car run rich with the 440cc injectors before ?
im new here and need help !

 

[FLounder]

you cant just change injectors without changing the tune! its probably lean as hell right now if its running the same duty cycle on the stockers as it was on the 440s. im assuming the car was chipped or hopefully tuned when you got it and it had the larger injectors?

you need to find a tuner in your area and get the car tuned asap. if the car is running right you will get great mileage, even with 440cc injectors.

 

[xEKx]

well idk if the car was tune with the 440cc he never told me it has stock si ecu
and now i got the stock injectors car runs good but its not as strong when vtec kick in as before.
im thinking of chippin the ecu and gettin tune with the 440 injectors and 255 fuel pump

 

[Magana559]

you cant just change injectors without changing the tune! its probably lean as hell right now if its running the same duty cycle on the stockers as it was on the 440s. im assuming the car was chipped or hopefully tuned when you got it and it had the larger injectors?

you need to find a tuner in your area and get the car tuned asap. if the car is running right you will get great mileage, even with 440cc injectors.